<?php$installer = $this;$installer->startSetup();if(!$installer->getConnection()->isTableExists($installer->getTable('reviewswithimg/review_img'))){	$table = $installer->getConnection()		->newTable($installer->getTable('reviewswithimg/review_img'))		->addColumn('img_id', Varien_Db_Ddl_Table::TYPE_INTEGER, null, array(			'identity'  => true,			'unsigned'  => true,			'nullable'  => false,			'primary'   => true,		), 'Image Id')		->addColumn('img_name', Varien_Db_Ddl_Table::TYPE_VARCHAR, 255, array(		), 'Image Name')		->addColumn('review_id', Varien_Db_Ddl_Table::TYPE_BIGINT, null, array(			'unsigned'  => true,			'nullable'  => false,			'default'   => '0',		), 'Review Id')		->setComment('Review Images');	$installer->getConnection()->createTable($table);}$installer->endSetup();